Refine your search:     
Report No.
 - 
Search Results: Records 1-20 displayed on this page of 21

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Penetration factor and indoor deposition rate of elementary and particulate iodine in a Japanese house for assessing the effectiveness of sheltering for radiation exposures

Hirouchi, Jun; Takahara, Shogo; Komagamine, Hiroshi*; Kato, Nobuyuki*; Matsui, Yasuto*; Yoneda, Minoru*

Journal of Radiological Protection, 41(3), p.S139 - S149, 2021/09

 Times Cited Count:2 Percentile:32.89(Environmental Sciences)

Sheltering is one of the countermeasures for protection against radiation exposures in nuclear accidents. The effectiveness of sheltering is often expressed by the reduction factor, that is the ratio of the indoor to the outdoor cumulative radioactivity concentrations or doses. The indoor concentration is mainly controlled by the air exchange rate, penetration factor, and indoor deposition rate. The penetration factor and indoor deposition rate depend on the surface and opening materials. We investigated experimentally these parameters of I$$_{2}$$ and particles. The experiment was performed in two apartment houses, three single-family houses, and chambers. The obtained penetration factor ranged 0.3 $$sim$$ 1 for particles of 0.3 $$sim$$ 1 $$mu$$m and 0.15 $$sim$$ 0.7 for I$$_{2}$$ depending on the air exchange rate. The indoor deposition rate for a house room ranged 0.007 $$sim$$ 0.2 h$$^{-1}$$ for particles of 0.3$$sim$$1 $$mu$$m and 0.2$$sim$$1.5 h$$^{-1}$$ for I$$_{2}$$ depending on floor materials.

Journal Articles

Effect of bacterial siderophore on cesium dissolution from biotite

Kimura, Tatsuki*; Fukutani, Satoshi*; Ikegami, Maiko*; Sakamoto, Fuminori; Kozai, Naofumi; Grambow, B.*; Yoneda, Minoru*

Chemosphere, 276, p.130121_1 - 130121_7, 2021/08

 Times Cited Count:1 Percentile:6.45(Environmental Sciences)

The adsorption of cesium (Cs) on biotite and dissolution of Cs from Cs-bearing biotite using a siderophore were investigated aiming to contribute to the elucidation of radiocesium migration mechanisms in the soil environment. Cs was adsorbed on a hardly weathered biotite powder sample. A siderophore was extracted and purified from the bacterial culture medium, and the purified siderophore was used in five consecutive dissolution experiments of the biotite samples. The major components of the biotite (Al, Fe, and Mg) were dissolved almost stoichiometrically, strongly suggesting that the siderophore selectively dissolves the broken edges of the biotite. The Cs adsorbed on the broken edges was dissolved rapidly as the siderophore dissolved the broken edges, and then, the Cs adsorbed on the outer planar surface of the biotite particles was slowly dissolved.

Journal Articles

A Probabilistic Approach to Assess External Doses to the Public Considering Spatial Variability of Radioactive Contamination and Interpopulation Differences in Behavior Pattern

Takahara, Shogo; Iijima, Masashi*; Yoneda, Minoru*; Shimada, Yoko*

Risk Analysis, 39(1), p.212 - 224, 2019/01

AA2016-0374.pdf:0.62MB

 Times Cited Count:5 Percentile:49.19(Public, Environmental & Occupational Health)

A dose assessment model was developed based on measurements and surveys of individual doses and relevant contributors in Fukushima City for four population groups: Fukushima City Office staff, Senior Citizens' Club, Contractors' Association, and AgriculturalCooperative. In addition, probabilistic assessments were performed for these population groups by considering the spatial variability of contamination and interpopulation differencesresulting from behavior patterns. As a result of comparison with the actual measurements, the assessment results for participants from the Fukushima City Office, Senior Citizens' Club and the Agricultural Cooperative agreed with the measured values. By contrast, the measurements obtained for the participants from the Contractors' Association were not reproduced well in the present study. To assess the doses to this group, further investigations of association members' work activities and the related dose reduction effects are needed.

Journal Articles

Estimation of radiocesium dietary intake from time series data of radiocesium concentrations in sewer sludge

Pratama, M. A.; Takahara, Shogo; Munakata, Masahiro; Yoneda, Minoru*

Environment International, 115, p.196 - 204, 2018/06

 Times Cited Count:2 Percentile:7.31(Environmental Sciences)

Journal Articles

Bioaccessibility of Fukushima-accident-derived Cs in soils and the contribution of soil ingestion to radiation doses in children

Takahara, Shogo; Ikegami, Maiko*; Yoneda, Minoru*; Kondo, Hitoshi*; Ishizaki, Azusa; Iijima, Masashi; Shimada, Yoko*; Matsui, Yasuto*

Risk Analysis, 37(7), p.1256 - 1267, 2017/07

AA2015-0445.pdf:0.53MB

 Times Cited Count:6 Percentile:52.4(Public, Environmental & Occupational Health)

Journal Articles

Journal Articles

Bioaccessibility of radioactive cesium in soils

Takahara, Shogo; Ikegami, Maiko*; Yoneda, Minoru*; Kondo, Hitoshi*; Ishizaki, Azusa; Shimada, Yoko*

Dai-21-Kai Chikasui, Dojo Osen To Sono Boshi Taisaku Ni Kansuru Kenkyu Shukai Koenshu (CD-ROM), p.505 - 510, 2015/06

BB2014-3402.pdf:0.58MB

Doses received by the public are necessary information in management of radiation exposures in areas contaminated by the Fukushima Daiichi Nuclear Power Plant (1F) accident. Direct ingestion of contaminated soil is one of the exposure pathways which is a concern for the people living in the areas in terms of children's exposure. Therefore in order to manage efficiently the middle and the long term exposures with a sense of safety of the people, we have to clarify the contribution of this pathway to the doses received by those. However, a fractional absorption of radioactive cesium in gastrointestinal system has not been evaluated yet. We evaluated this factor based on the results of a physiologically based extraction test and an extraction test with hydrochloric acid, which is adopted in Japanese national law to evaluate a fractional absorption of heavy metals in gastrointestinal system. In addition, we assessed the doses to the public from this pathway after the 1F accident.

JAEA Reports

None

; Yoneda, Shigeo*; Koyakaichi, Minoru*

PNC TJ7308 93-005, 292 Pages, 1993/03

PNC-TJ7308-93-005.pdf:6.95MB

no abstracts in English

JAEA Reports

None

Yoneda, Shigeo*; Koyakaichi, Minoru*; Sakuramoto, Yuji*

PNC TJ7308 91-001VOL1, 119 Pages, 1991/03

PNC-TJ7308-91-001VOL1.pdf:3.08MB

no abstracts in English

Oral presentation

Time-dependence of radiocesium concentration in separate sewer sludge; A New method to estimate the ingestion intake of cesium

Pratama, M. A.; Takahara, Shogo; Munakata, Masahiro; Homma, Toshimitsu; Yoneda, Minoru*

no journal, , 

Oral presentation

Oral presentation

Examination of the decreasing effect on internal exposure by sheltering, 5; Investigation of deposition rate in real houses

Hirouchi, Jun; Takahara, Shogo; Komagamine, Hiroshi*; Munakata, Masahiro; Kimoto, Shigeru*; Yoneda, Minoru*; Matsui, Yasuto*

no journal, , 

no abstracts in English

Oral presentation

Examination of the decreasing effect on internal exposure by sheltering, 4; Investigation of penetration factor with a test chamber

Kimoto, Shigeru*; Sadatani, Yoshiro*; Yoneda, Minoru*; Matsui, Yasuto*; Hirouchi, Jun

no journal, , 

no abstracts in English

Oral presentation

Experimental evaluation on behavior of iodine gas

Kimoto, Shigeru*; Shiota, Kenji*; Nishiguchi, Kohei*; Matsui, Yasuto*; Hirouchi, Jun; Yoneda, Minoru*

no journal, , 

no abstracts in English

Oral presentation

Measurement experiment of particle deposition rate and ventilation rate in houses

Shakagori, Shota*; Murai, Chiaki*; Kimoto, Shigeru*; Matsui, Yasuto*; Yoneda, Minoru*; Hirouchi, Jun

no journal, , 

no abstracts in English

Oral presentation

Bioaccessibility of Cs-137 in wild boars contaminated by the Fukushima Daiichi Nuclear Power Plant accident

Takahara, Shogo; Pratama, M. A.*; Ikegami, Maiko*; Fukutani, Satoshi*; Yoneda, Minoru*

no journal, , 

We experimentally evaluated the absorption fraction in gastrointestinal system of Cs-137 in wild boar meat contaminated by the Fukushima Daiichi Nuclear Power Plant accident. Wild boar was hunted in difficult-to-return zone in December 2017. For three parts of the meat (Loin, Brisket, Round), extraction tests were performed based on in-vitro digestion method by Minekus et al. (2014). From this test, the extraction rate in small intestinal was evaluated as 89%$$pm$$3%.

Oral presentation

Penetration factor and indoor deposition rate of elementary and particulate iodine in a Japanese house for assessing the effectiveness of sheltering for radiation exposures

Hirouchi, Jun; Takahara, Shogo; Komagamine, Hiroshi*; Kato, Nobuyuki*; Matsui, Yasuto*; Yoneda, Minoru*

no journal, , 

Sheltering is one of the countermeasures for protection against radiation exposures in nuclear accidents. The effectiveness of sheltering is often expressed by the reduction factor, that is the ratio of the indoor to the outdoor cumulative radioactivity concentrations or doses. The indoor concentration is mainly controlled by the air exchange rate, penetration factor, and indoor deposition rate. The penetration factor and indoor deposition rate depend on the surface and opening materials. We investigated experimentally these parameters of I$$_{2}$$ and particles. The experiment was performed in two apartment houses, three single-family houses, and chambers. The obtained penetration factor ranged 0.3 $$sim$$ 1 for particles of 0.3 $$sim$$ 1 $$mu$$m and 0.1 $$sim$$ 0.6 for I$$_{2}$$ depending on the air exchange rate. The indoor deposition rate for a house room ranged 0.007 $$sim$$ 0.2 h$$^{-1}$$ for particles of 0.3$$sim$$1 $$mu$$m and 0.2$$sim$$1.5 h$$^{-1}$$ for I$$_{2}$$ depending on floor materials.

Oral presentation

Dose assessment for residents in the residential environment considering the transfer of substances between indoor and outdoor after nuclear accidents, 2; Penetration of materials resuspended outdoors

Hirouchi, Jun; Watanabe, Masatoshi*; Hayashi, Naho; Nagakubo, Azusa; Matsui, Yasuto*; Yoneda, Minoru*; Takahara, Shogo

no journal, , 

no abstracts in English

Oral presentation

Dose assessment for residents in the residential environment considering the transfer of substances between indoor and outdoor after nuclear accidents, 1; Overview of research project

Takahara, Shogo; Nagakubo, Azusa; Hirouchi, Jun; Hayashi, Naho; Matsui, Yasuto*; Yoneda, Minoru*

no journal, , 

no abstracts in English

21 (Records 1-20 displayed on this page)